package com.heima.app.gateway.filter;


import com.alibaba.fastjson.JSON;

import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Component
@Slf4j
@Order(-1)
public class AuthorizeFilter implements GlobalFilter {
    private static List<String> urlList = new ArrayList<>();
    // 初始化白名单 url路径
    static {
        urlList.add("/login/in");
        urlList.add("/v2/api-docs");
        urlList.add("/login/login_auth");
    }
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //获取请求路径 判断路径是否属于白名单路径
        String path = request.getURI().getPath();
        for (String allowUri : urlList) {
            if (path.contains(allowUri)){
                return chain.filter(exchange);
            }
        }
        //获取请求头中的token值
        String token = request.getHeaders().getFirst("token");
        if (StringUtils.isBlank(token)){
//            response.setStatusCode(HttpStatus.UNAUTHORIZED);
//            return response.setComplete();
            return writeMessage(exchange,"没有token");
        }
        //校验token是否有效
        try{
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int i = AppJwtUtil.verifyToken(claimsBody);
            if (i < 1){
                    Object id = claimsBody.get("id");
                    request.mutate().header("userId",String.valueOf(id));
                    return chain.filter(exchange);
            }else{
                log.error("token失效");
            }
        }catch (Exception e){
            e.printStackTrace();
            log.error("解析token失败");
        }
//        response.setStatusCode(HttpStatus.UNAUTHORIZED);
//        return response.setComplete();
        return  writeMessage(exchange,"token解析失败");
    }

    /**
     * 返回错误提示信息
     * @return
     */
    private Mono<Void> writeMessage(ServerWebExchange exchange, String message) {
        Map<String, Object> map = new HashMap<>();
        map.put("code", HttpStatus.UNAUTHORIZED.value());
        map.put("errorMessage", message);
        //获取响应对象
        ServerHttpResponse response = exchange.getResponse();
        //设置状态码
        response.setStatusCode(HttpStatus.UNAUTHORIZED);
        //response.setStatusCode(HttpStatus.OK);
        //设置返回类型
        response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
        //设置返回数据
        DataBuffer buffer = response.bufferFactory().wrap(JSON.toJSONBytes(map));
        //响应数据回浏览器
        return response.writeWith(Flux.just(buffer));
    }
}
